NightOwl888 opened a new pull request, #691:
URL: https://github.com/apache/lucenenet/pull/691

   Fixes #675.
   
   While the System.Memory package allows the use of `ReadOnlySpan<T>` in all 
target frameworks, the methods overloads that accept `ReadOnlySpan<T>` 
parameters are only available in `net6.0` and in most cases, `netstandard2.1`. 
Therefore, at least for this use case, it was impractical to use System.Memory 
and we have new conditional compilation features to enable the `AsSpan()` calls 
when the APIs exist to utilize them.
   
   - FEATURE_STRING_CONCAT_READONLYSPAN (`net6.0` only)
   - FEATURE_NUMBER_PARSE_READONLYSPAN (`net6.0` and `netstandard2.1` only)
   - FEATURE_STREAM_READ_SPAN (`net6.0` and `netstandard2.1` only)
   - FEATURE_STRINGBUILDER_APPEND_READONLYSPAN (`net6.0` and `netstandard2.1` 
only)
   


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